Bird's-eye

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  1. Mixed screened anthracite passing a 1/2-in (12.7-mm) screen, but retained on a 1/8-in (3.2-mm) screen. May be subdivided into buckwheat, rice, and barley. See also: anthracite coal sizes; barley; bird's-eye coal. CTD
  2. Eng. Applied to various rocks with small spots, in some places to a concretionary slate, and in Guernsey to a spotted variety of diorite or gabbro. Arkell

Source: Dictionary of Mining, Mineral, and Related Terms


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